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Seagate 6TB Enterprise Capacity 3.5 HDD v4 RAID Analysis

By: Paul Alcorn | RAID/HBA in IT/Datacenter | Posted: Sep 26, 2014 1:10 am

RAID 0 4k Random Read/Write




Each level tested includes 300 data points (five minutes of one second reports) to illustrate performance variability. The line for each OIO depth represents the average speed reported during the five-minute interval. 4k random speed measurements are an important metric when comparing drive performance, as the hardest type of file access for any storage solution to master is small-file random. 4k random performance is a heavily marketed figure, and one of the most sought-after performance specifications.


The four-drive array averages 761 IOPS at 256 OIO (Outstanding I/Os). The eight Seagate V4's make the jump up to 1,454 IOPS at 256 OIO - barely shy of providing perfectly linear scaling.




Latency performance becomes less consistent as we move from four drives to eight drives in the random read workload.




The eight-drive Seagate v4's provide 1,235 IOPS at 256 OIO, a nearly perfect linear scaling from the 646 IOPS provided by the four-drive array.




The write latency results also feature a bit more variability as we add more drives.




Our write percentage testing illustrates the varying performance of each solution with mixed workloads. The 100% column to the right is a pure 4k write workload, and 0% represents a pure 4k read workload.


In mixed workloads, the addition of several drives pays big dividends. In some mixtures, particularly as we mix in more write activity, we observe more than double the performance of the four-drive array.

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